Thursday 1 June saw potentially the lowest June temperature on record in Finland. A weather station in Lapland, Enontekiö Kilpisjärvi Saana, reached -7.7C. This may not seem that cold for northern Finland, where winter temperatures reach as low as -51.5C, but the last time Lapland saw a minimum temperature of -7C in June was on 3 June 1962.
In addition, at this time of year Lapland experiences midnight sun where it is constantly light and the sun does not set. This unseasonal cold was possible in the first month of summer due to a large area of high pressure to the west of Finland, blocking the usual westerly/south-westerly flow of weather systems across the Atlantic and North Sea.
The mostly stationary area of high pressure to the west meant that polar air continued to flow in